PhD Student, Indian Institute of Technology Bombay
Solar PV performance estimation
The work presented in this thesis covers the detailed investigation of important aspects of PV module performance in the Indian environmental conditions. The PV module performance deviates with the change in environmental parameters, which is analyzed and estimated using different approaches in this work. PV performance analysis has been simultaneously carried out on three different PV technology modules for the first time. The work can help to investigate precisely the environmental effects on the total power generation through the presented approach. Further, the work will be helpful in choosing the appropriate technology at a particular site. In addition, important recommendation can be formulated for the installer, manufacturer and consumer for the Indian climate.
Abstract: The current–voltage (I-V) characteristics of 15 different photovoltaic modules are monitored during more than 2 years of operation at four locations (Germany, Italy, India and Arizona) corresponding to four different climate zones. The electrical stability of the photovoltaic modules during the time of outdoor exposure is investigated in terms of measured I-V curve translated to standard test conditions. This translation compensates the influence of module temperature, irradiance, spectral effects and soiling on the I-V curves. The changes of output power after these corrections are attributed to initial consolidation phases, to long-term degradation of the electrical properties and to seasonal cycles associated with metastabilities. Modules made from crystalline Si turn out to show no or only minor effects. Thin-Film modules (CdTe, Cu(In,Ga)Se2 and thin-film Si) exhibit a wide spread of metastable behaviour with consistent patterns for identical modules in different climates but with significant differences amongst different manufacturers of the same thin-film technology. We show further that this metastable behaviour influences the energy yield of the modules. Copyright © 2017 John Wiley & Sons, Ltd.
Pub.: 30 Jun '17, Pinned: 24 Aug '17
Abstract: Photovoltaic (PV) cell/module/array temperature calculations are essential to accurately assess its electrical performance. In this paper, we developed and validated two new models, and then we focused on the comparison of ten theoretical models (including our models) with experimental measurements, based on the ambient temperature, the in-plane array irradiance with/without taking into account the wind speed. These models were used to determine the PV module temperature of a 7.2 kWp standalone photovoltaic power plant installed in Elkaria village (Province of Essaouira, Morocco). The results show that our model without wind yields the highest value of the correlation coefficient R2=96.7% and the lowest value of the root mean square error RMSE=1.6 °C among the models without wind. On the other hand, our model with wind gives the best statistical coefficients (R2=98.8% and RMSE=1.1 °C) compared to all models (with/without wind).
Pub.: 05 Jul '17, Pinned: 24 Aug '17
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